 Within six months of joining the Green Party, he was given a position as one of its four principal speakers, positions created in lieu of a single leader.His second book, "It Doesn't Have To Be Like This", an outline of his views on the environment, was published in 1989, and he was regularly invited to high-profile events.That year he discussed animal rights during a televised debate at the Royal Institution, alongside Tom Regan, Mary Warnock and Germaine Greer, and in 1990 his name appeared on advertisements for a children's charity, along with Audrey Hepburn, Woody Allen and other celebrities.